This early Monday, Jan. 1, 2018, photo released by Utah Department of Public Safety shows the scene of a Greyhound bus crash in rural Green River, Utah, Authorities are investigating the bus crash that killed a 13-year-old girl and injured at least 11 others. Utah's Highway Patrol says the bus headed to Las Vegas crashed Sunday night off Interstate 70 west of the Utah city of Green River. The bus went off the highway shoulder into a steep wash and stopped about 200 feet away from the road. The bus driver and two passengers were airlifted in serious condition to hospitals in Colorado and Utah. Eight others were also hospitalized.

Ben Tidswell, The Deseret News via AP

The aftermath of a late-Sunday Greyhound bus crash is seen on Monday, Jan. 1, 2018 in Emery County. A 13-year-old girl died and 11 others were hospitalized when the bus went off the freeway and crashed into a steep wash.

Ben Tidswell, The Deseret News via AP

The aftermath of a late-Sunday Greyhound bus crash is seen on Monday, Jan. 1, 2018 in Emery County. A 13-year-old girl died and 11 others were hospitalized when the bus went off the freeway and crashed into a steep wash.

Ben Tidswell, The Deseret News via AP

The aftermath of a late-Sunday Greyhound bus crash is seen on Monday, Jan. 1, 2018 in Emery County. A 13-year-old girl died and 11 others were hospitalized when the bus went off the freeway and crashed into a steep wash.

SALT LAKE CITY — A Greyhound bus careened from a highway and plunged into a deep wash, killing a 13-year-old girl and injuring 12 other people on New Year’s Eve in rural Utah, state troopers said Monday.

Investigators were still trying to determine what caused the crash along Interstate 70 west of the city of Green River.

However, a passenger reported a possible medical issue with the driver, the Utah Highway Patrol said in a news release.

The bus was heading west across the desert from Green River to Las Vegas, Trooper Jared Cornia said.

It went off the shoulder of the highway around 11 p.m. and plunged into the wash, crashing about 200 feet from the highway.

Authorities identified the girl killed as Summer Pinzon from Azusa, California. She was traveling with her mother, who was taken to a hospital after the crash.

Authorities did not release the mother’s name or additional details about her and her daughter.

The bus driver and two passengers were taken by helicopters in serious condition to hospitals in Colorado and Utah.

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